Yes you can.
Since all your local controllers have a copy of the config from the master you could detach one of those and make it a Master (This will require a reboot) , no need to create the config from scratch
But need to make sure of the following:
- if you have any internal guest accounts you will need to import those into that controller.
- If you are using DNS to discover the Master you may need to use a new VLAN / DHCP Scope using DHCP Option 43 for the new APs so those can discover the new Master controller.
Is not a pretty solution but it can get you there.